LINCOLN, Neb. — Nebraska Gov. Dave Heineman approved a new route for the Keystone XL oil pipeline today that avoids the state’s environmentally sensitive Sandhills region. Heineman sent a letter to President Barack Obama confirming that he would allow the controversial, Canada-to-Texas pipeline to proceed through his state. The project has faced some of its strongest resistance in Nebraska from a coalition of landowners and environmental groups who say it would contaminate the Ogallala aquifer, a massive groundwater supply. Canadian pipeline developer TransCanada and some workers’ unions say the project is safe and will create thousands of jobs. The original route would have run the pipeline through a region of erodible, grass-covered sand dunes. The new route skirts that area, although the pipeline’s most vocal critics remain firmly opposed to it as well. “Governor Heineman just performed one of the biggest flip-flops that we’ve in Nebraska political history,” said Jane Kleeb, executive director of the group Bold Nebraska. Heineman said previously that he would oppose any pipeline route through the Sandhills region.